The codependent molds himself/herself and bends over backward to cater to the needs of his nearest and dearest and satisfy their every whim, wish, expectation, and demand. Nothing is too unpleasant or unacceptable if it serves to secure the uninterrupted presence of the codependent's family and friends and the emotional sustenance s/he can extract (or extort) from them.
The codependent does not feel fully alive when alone. S/he feels helpless, threatened, ill-at-ease, and child-like. This acute discomfort drives the codependent to hop from one relationship to another. The sources of nurturance are interchangeable. To the codependent, being with someone, with anyone, no matter whom - is always preferable to solitude. (From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase: http://www.narcissistic-abuse.com/thebook.html)